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Optics Express

Optics Express

  • Editor: C. Martijin de Sterke
  • Vol. 19, Iss. 7 — Mar. 28, 2011
  • pp: 5772–5784

Automatic diagnosis and control of distributed solid state lighting systems

Jianfei Dong, Willem van Driel, and Guoqi Zhang  »View Author Affiliations

Optics Express, Vol. 19, Issue 7, pp. 5772-5784 (2011)

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This paper describes a new design concept of automatically diagnosing and compensating LED degradations in distributed solid state lighting (SSL) systems. A failed LED may significantly reduce the overall illumination level, and destroy the uniform illumination distribution achieved by a nominal system. To our knowledge, an automatic scheme to compensate LED degradations has not yet been seen in the literature, which requires a diagnostic step followed by control reconfigurations. The main challenge in diagnosing LED degradations lies in the usually unsatisfactory observability in a distributed SSL system, because the LED light output is usually not individually measured. In this work, we tackle this difficulty by using pulse width modulated (PWM) drive currents with a unique fundamental frequency assigned to each LED. Signal processing methods are applied in estimating the individual illumination flux of each LED. Statistical tests are developed to diagnose the degradation of LEDs. Duty cycle of the drive current signal to each LED is re-optimized once a fault is detected, in order to compensate the destruction of the uniform illumination pattern by the failed LED.

© 2011 Optical Society of America

OCIS Codes
(220.4830) Optical design and fabrication : Systems design
(230.3670) Optical devices : Light-emitting diodes
(110.2945) Imaging systems : Illumination design
(150.5495) Machine vision : Process monitoring and control

ToC Category:
Optical Design and Fabrication

Original Manuscript: December 23, 2010
Revised Manuscript: February 7, 2011
Manuscript Accepted: February 7, 2011
Published: March 14, 2011

Jianfei Dong, Willem van Driel, and Guoqi Zhang, "Automatic diagnosis and control of distributed solid state lighting systems," Opt. Express 19, 5772-5784 (2011)

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